CVE-2021-2208: 
MySQL vulnerability analysis and mitigation

Vulnerability in the MySQL Server product of Oracle MySQL (component: Server: Partition) affects versions 8.0.23 and prior. This vulnerability was disclosed on April 22, 2021, with CVE identifier CVE-2021-2208 (Oracle Advisory, NIST NVD).

The vulnerability has a CVSS 3.1 Base Score of 4.9 (Medium severity) with the following vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H. The vulnerability requires high privileges and network access via multiple protocols to exploit. The attack complexity is considered low, and no user interaction is required (Oracle Advisory).

Successful exploitation of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server. The vulnerability only affects availability with no impact on confidentiality or integrity (NIST NVD).

The vulnerability is considered easily exploitable by a high privileged attacker with network access via multiple protocols. The attack requires no user interaction and has low attack complexity (Oracle Advisory).

Oracle released patches to address this vulnerability in MySQL version 8.0.25. Ubuntu has also released fixes for affected systems in version 8.0.25-0ubuntu3 for various releases including 20.04 LTS, 21.04, and others (Ubuntu Security).